author | kergoth <kergoth> | 2002-01-25 22:14:26 (UTC) |
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committer | kergoth <kergoth> | 2002-01-25 22:14:26 (UTC) |
commit | 15318cad33835e4e2dc620d033e43cd930676cdd (patch) (unidiff) | |
tree | c2fa0399a2c47fda8e2cd0092c73a809d17f68eb /core/multimedia/opieplayer/libmpeg3/bitstream.h | |
download | opie-15318cad33835e4e2dc620d033e43cd930676cdd.zip opie-15318cad33835e4e2dc620d033e43cd930676cdd.tar.gz opie-15318cad33835e4e2dc620d033e43cd930676cdd.tar.bz2 |
Initial revision
Diffstat (limited to 'core/multimedia/opieplayer/libmpeg3/bitstream.h') (more/less context) (show whitespace changes)
-rw-r--r-- | core/multimedia/opieplayer/libmpeg3/bitstream.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/core/multimedia/opieplayer/libmpeg3/bitstream.h b/core/multimedia/opieplayer/libmpeg3/bitstream.h new file mode 100644 index 0000000..2f6dcf9 --- a/dev/null +++ b/core/multimedia/opieplayer/libmpeg3/bitstream.h | |||
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1 | /********************************************************************** | ||
2 | ** Copyright (C) 2000 Trolltech AS. All rights reserved. | ||
3 | ** | ||
4 | ** This file is part of Qtopia Environment. | ||
5 | ** | ||
6 | ** This file may be distributed and/or modified under the terms of the | ||
7 | ** GNU General Public License version 2 as published by the Free Software | ||
8 | ** Foundation and appearing in the file LICENSE.GPL included in the | ||
9 | ** packaging of this file. | ||
10 | ** | ||
11 | ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE | ||
12 | ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | ||
13 | ** | ||
14 | ** See http://www.trolltech.com/gpl/ for GPL licensing information. | ||
15 | ** | ||
16 | ** Contact info@trolltech.com if any conditions of this licensing are | ||
17 | ** not clear to you. | ||
18 | ** | ||
19 | **********************************************************************/ | ||
20 | #ifndef BITSTREAM_H | ||
21 | #define BITSTREAM_H | ||
22 | |||
23 | #include "mpeg3demux.h" | ||
24 | |||
25 | #if defined(__cplusplus) | ||
26 | extern "C" { | ||
27 | #endif | ||
28 | |||
29 | // next bit in forward direction | ||
30 | // next bit in reverse direction | | ||
31 | // v v | ||
32 | // | | | | | | | | | | | | | | | | | | | | | | | | | | |1|1|1|1|1|1| */ | ||
33 | // ^ ^ | ||
34 | // | bit_number = 1 | ||
35 | // bfr_size = 6 | ||
36 | |||
37 | typedef struct | ||
38 | { | ||
39 | unsigned MPEG3_INT32 bfr; /* bfr = buffer for bits */ | ||
40 | int bit_number; /* position of pointer in bfr */ | ||
41 | int bfr_size; /* number of bits in bfr. Should always be a multiple of 8 */ | ||
42 | struct mpeg3_rec *file; /* Mpeg2 file */ | ||
43 | mpeg3_demuxer_t *demuxer; /* Mpeg2 demuxer */ | ||
44 | /* If the input ptr is true, data is read from it instead of the demuxer. */ | ||
45 | unsigned char *input_ptr; | ||
46 | } mpeg3_bits_t; | ||
47 | |||
48 | LIBMPEG_EXPORT unsigned int mpeg3demux_read_char_packet(mpeg3_demuxer_t *demuxer); | ||
49 | LIBMPEG_EXPORT unsigned int mpeg3demux_read_prev_char_packet(mpeg3_demuxer_t *demuxer); | ||
50 | |||
51 | /* ======================================================================== */ | ||
52 | /* Entry Points */ | ||
53 | /* ======================================================================== */ | ||
54 | |||
55 | #define mpeg3bits_tell_percentage(stream) mpeg3demux_tell_percentage((stream)->demuxer) | ||
56 | |||
57 | #define mpeg3bits_packet_time(stream) mpeg3demux_current_time((stream)->demuxer) | ||
58 | |||
59 | #define mpeg3bits_time_offset(stream) mepg2demux_time_offset((stream)->demuxer) | ||
60 | |||
61 | #define mpeg3bits_error(stream) mpeg3demux_error((stream)->demuxer) | ||
62 | |||
63 | #define mpeg3bits_eof(stream) mpeg3demux_eof((stream)->demuxer) | ||
64 | |||
65 | #define mpeg3bits_bof(stream) mpeg3demux_bof((stream)->demuxer) | ||
66 | |||
67 | /* Read bytes backward from the file until the reverse_bits is full. */ | ||
68 | static inline void mpeg3bits_fill_reverse_bits(mpeg3_bits_t* stream, int bits) | ||
69 | { | ||
70 | // Right justify | ||
71 | while(stream->bit_number > 7) | ||
72 | { | ||
73 | stream->bfr >>= 8; | ||
74 | stream->bfr_size -= 8; | ||
75 | stream->bit_number -= 8; | ||
76 | } | ||
77 | |||
78 | // Insert bytes before bfr_size | ||
79 | while(stream->bfr_size - stream->bit_number < bits) | ||
80 | { | ||
81 | if(stream->input_ptr) | ||
82 | stream->bfr |= (unsigned int)(*--stream->input_ptr) << stream->bfr_size; | ||
83 | else | ||
84 | stream->bfr |= (unsigned int)mpeg3demux_read_prev_char(stream->demuxer) << stream->bfr_size; | ||
85 | stream->bfr_size += 8; | ||
86 | } | ||
87 | } | ||
88 | |||
89 | /* Read bytes forward from the file until the forward_bits is full. */ | ||
90 | extern inline void mpeg3bits_fill_bits(mpeg3_bits_t* stream, int bits) | ||
91 | { | ||
92 | while(stream->bit_number < bits) | ||
93 | { | ||
94 | stream->bfr <<= 8; | ||
95 | if(stream->input_ptr) | ||
96 | { | ||
97 | stream->bfr |= *stream->input_ptr++; | ||
98 | } | ||
99 | else | ||
100 | { | ||
101 | stream->bfr |= mpeg3demux_read_char(stream->demuxer); | ||
102 | } | ||
103 | stream->bit_number += 8; | ||
104 | stream->bfr_size += 8; | ||
105 | if(stream->bfr_size > 32) stream->bfr_size = 32; | ||
106 | } | ||
107 | } | ||
108 | |||
109 | /* Return 8 bits, advancing the file position. */ | ||
110 | extern inline unsigned int mpeg3bits_getbyte_noptr(mpeg3_bits_t* stream) | ||
111 | { | ||
112 | if(stream->bit_number < 8) | ||
113 | { | ||
114 | stream->bfr <<= 8; | ||
115 | if(stream->input_ptr) | ||
116 | stream->bfr |= *stream->input_ptr++; | ||
117 | else | ||
118 | stream->bfr |= mpeg3demux_read_char(stream->demuxer); | ||
119 | |||
120 | stream->bfr_size += 8; | ||
121 | if(stream->bfr_size > 32) stream->bfr_size = 32; | ||
122 | |||
123 | return (stream->bfr >> stream->bit_number) & 0xff; | ||
124 | } | ||
125 | return (stream->bfr >> (stream->bit_number -= 8)) & 0xff; | ||
126 | } | ||
127 | |||
128 | extern inline unsigned int mpeg3bits_getbit_noptr(mpeg3_bits_t* stream) | ||
129 | { | ||
130 | if(!stream->bit_number) | ||
131 | { | ||
132 | stream->bfr <<= 8; | ||
133 | stream->bfr |= mpeg3demux_read_char(stream->demuxer); | ||
134 | |||
135 | stream->bfr_size += 8; | ||
136 | if(stream->bfr_size > 32) stream->bfr_size = 32; | ||
137 | |||
138 | stream->bit_number = 7; | ||
139 | |||
140 | return (stream->bfr >> 7) & 0x1; | ||
141 | } | ||
142 | return (stream->bfr >> (--stream->bit_number)) & (0x1); | ||
143 | } | ||
144 | |||
145 | /* Return n number of bits, advancing the file position. */ | ||
146 | /* Use in place of flushbits */ | ||
147 | extern inline unsigned int mpeg3bits_getbits(mpeg3_bits_t* stream, int bits) | ||
148 | { | ||
149 | if(bits <= 0) return 0; | ||
150 | mpeg3bits_fill_bits(stream, bits); | ||
151 | return (stream->bfr >> (stream->bit_number -= bits)) & (0xffffffff >> (32 - bits)); | ||
152 | } | ||
153 | |||
154 | extern inline unsigned int mpeg3bits_showbits24_noptr(mpeg3_bits_t* stream) | ||
155 | { | ||
156 | while(stream->bit_number < 24) | ||
157 | { | ||
158 | stream->bfr <<= 8; | ||
159 | stream->bfr |= mpeg3demux_read_char(stream->demuxer); | ||
160 | stream->bit_number += 8; | ||
161 | stream->bfr_size += 8; | ||
162 | if(stream->bfr_size > 32) stream->bfr_size = 32; | ||
163 | } | ||
164 | return (stream->bfr >> (stream->bit_number - 24)) & 0xffffff; | ||
165 | } | ||
166 | |||
167 | extern inline unsigned int mpeg3bits_showbits32_noptr(mpeg3_bits_t* stream) | ||
168 | { | ||
169 | while(stream->bit_number < 32) | ||
170 | { | ||
171 | stream->bfr <<= 8; | ||
172 | stream->bfr |= mpeg3demux_read_char(stream->demuxer); | ||
173 | stream->bit_number += 8; | ||
174 | stream->bfr_size += 8; | ||
175 | if(stream->bfr_size > 32) stream->bfr_size = 32; | ||
176 | } | ||
177 | return stream->bfr; | ||
178 | } | ||
179 | |||
180 | extern inline unsigned int mpeg3bits_showbits(mpeg3_bits_t* stream, int bits) | ||
181 | { | ||
182 | mpeg3bits_fill_bits(stream, bits); | ||
183 | return (stream->bfr >> (stream->bit_number - bits)) & (0xffffffff >> (32 - bits)); | ||
184 | } | ||
185 | |||
186 | extern inline unsigned int mpeg3bits_getbits_reverse(mpeg3_bits_t* stream, int bits) | ||
187 | { | ||
188 | unsigned int result; | ||
189 | mpeg3bits_fill_reverse_bits(stream, bits); | ||
190 | result = (stream->bfr >> stream->bit_number) & (0xffffffff >> (32 - bits)); | ||
191 | stream->bit_number += bits; | ||
192 | return result; | ||
193 | } | ||
194 | |||
195 | extern inline unsigned int mpeg3bits_showbits_reverse(mpeg3_bits_t* stream, int bits) | ||
196 | { | ||
197 | unsigned int result; | ||
198 | mpeg3bits_fill_reverse_bits(stream, bits); | ||
199 | result = (stream->bfr >> stream->bit_number) & (0xffffffff >> (32 - bits)); | ||
200 | return result; | ||
201 | } | ||
202 | |||
203 | #if defined(__cplusplus) | ||
204 | } | ||
205 | #endif | ||
206 | |||
207 | #endif | ||